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(No Model.)

. I 2 Sheets-Sheet 1. J.'P. TIRRELL. GONG" 0R TAP BELL.

No. 416,243. Patented Deo. 3,' 1889.

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(No Model.) 2 Sheets-Sheet 2.

J. P. TIRRELL. GONG 0R TAP BELL.

No. 416,243. Patented Dec... 3, 1889.

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UNITED STATES PATENT OFFIC JACOB P. TIRRELL, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO DAVID ROUSSEAU, OF NElV YORK, N. Y. I

GONG OR TAP -BEL L.

PEC IFICATION forming part of Letters Patent No. 416,243, dated December 3, 1889.- 4 Application filed March 15, 1889. Serial No. 303,413. (No model.)

To all whom it may concern:

Be it known that I, JACOB P. TIRRELL, of 3oston, in the county of Suffolkand State of Massachusetts, have made a new and useful Invention 1n Gongs or Tap-Bells, of which the following is a specification.

My invention relates particnlarly to im-" movements in that class of bells or gongs which operate by or through the agency of an impelling power, as a spring or a weight,

and are controlled by electromagnetic means.

' sufficiently powerful to operate the gong or bell. I am aware, however, that electro-magnetic-controlling devices have been devised for this purpose, and it is to this type of apparatus that my improvements are especially directed.

My invention will be better understood by referring to the accompanying drawings and also to the following description, after which I will particularly point out in the claims the features which Iregard as novel with me.

In the drawings, Figure 1 is a side or elevational view of the entire apparatus, showing the bell-clapper in its normal or locked position. Fig. 2 is a similar view showing the bell-clapper in the act of striking; and Fig. 3 is a detail sectional view on line 3 3, Fig. 1.

The outline of the gong or bell is represented in both Figs. 1 and 2 in dotted lines, and it, with the base A to the apparatus, is supported in any desired manner on the wall or elsewhere.

The base A supports the frame-work B of the mechanism, which I will now describe.

0 is a main driving gear-wheel, having one end of a propelling-spring S attached to its shaft, the other end thereof being attached to the frame at O. This, gear-wheel meshes with a pinion Q, keyed to shaft IV. (See Fig. 3.)

N and N are two ratchet-wheels, also keyed to shaft W, the former designed to act as a holding-ratchet under influence of pawl P,

pivoted to the frame, and the latter as a propelling-ratchet for driving the clapper C, attached to a striking-arm F, which latter is journaled on shaft W, with a sleeve Z, as shown in Fig. 3. I

I is an arm or lever rigidly secured to or a part of the striking arm or lever F, and to its free end is pivoted a push-rod K, having a sliding bearing through a cross-bar G, and attached to pawl P, adapted to control the operation of this pawl, as will be described later on. v v

P is a spring-pressed pawl pivotally se cured to the striking-arm F, and adapted to take in the teeth T of the propelling-ratchet N on the backward stroke of the striking arm or lever F. Near the outer or free end 'of the striking arm or lever F is a hookshaped extension H, adapted to bear, when in the position shown in Fig. 1, against the beveled shoulder of a dog E, pivoted at e. This -dog is held normally against a pin a by a fiat leaf-spring s, and all of said parts are carried on the shorter arm of a lever D, pivoted to the frame at d, and carrying at its upper end an escapement m, normally held against the weight of the lever F and clapper G by spring S and the armature L of the controlling electro-magnet M.

V is an adjustment-screw for regulating the adjustment of the escapement and armature-lever L.

S and S are spiral springs on the pushrod K, the former for forcing the pawl P into place in a tooth of ratchet-wheel N on the downward stroke of said rod, and the latter for releasing the pawl on the backward stroke of the striking-arm F.

D is a guide-block lying in the path of the pawl P, which is normally held awayfrom the teeth of ratchet N by a leaf-spring 25, (shown in dotted lines,) said block D being adapted to force the pawl inward into contact with any one ofthe teeth T, so that when the ratchet advances 'it will come into operative relation with the pawl, as will be explained later on.

I will now describe the mode of operation. Normally the apparatus is in the position shown in Fig. 1, with the striking-lever F locked in its uppermost position and the detcnt-lcver D held by armat ure-leverL, t he ma gnet M beingdemagnetized. On closing the circuit, for an instant only, through magnet M, and then breaking it again, the apparatus will give one stroke, as follows: The detentlever D, having been released, turns about pivot (1, under the weight of the strikinglever F and clapper C, until the hook II is released, the lever thus being allowed to make its full backward stroke, at the end of which the free end of pawl P rides up against the guide-block D and is forced against one of the teeth Tof ratchet N. At the same time the push-rod K is carried upward by the arm I, thus bringing the spiral spring S firmly in contact with the under side of the cross-bar G, attached to the pawl I. The striking force due to lever F and clapper G on this back-stroke is sufficient, in acting through the pawl P and ratchet N, to n1omentarily overcome the greater portion of the strain on pawl P from ratchet N and spring S, and to therefore permit the spring S to raise said pawl out of contact with that tooth '1 with which it has bearing. As soon asthis occurs the spring 5, acting through gear C, pinion Q, and ratchet N and pawl P forces the lever F and clapper 0 forward with great force, and causes the latter to strike the gong a blow and the hook H to be restored to its normal or locked position, provided the circuit is open; or if it is closed permanently the apparatus will continue repeating the strokes until the spring runs down. It will thus be I claim, and desire to secure by Letters Patent of the United States, is

1. In a gong or hell for signaling purposes, the combination of the following parts: a spring impelled mechanism, a pawl and ratchet for holding said mechanism from operatin g, a striking-level. carrying a pawl which is adapted to take in a second ratchet borne by the same shaft as the first ratchet, apushlever connected to the striking-lever and adapted to release or restore the firstrnamed pawl according to the position of the strikinglever,a detent-lever, a locking-dog, and an electro-magnet having an armature which normally holds the detent-lever and its dog in locking position, substantially as described.

2. A gong or bell having the following elements in combination: a spring-impelled train of gear, a-ratchct on the last shaft of said train, a pawl which normally holds said train from running, a second ratchetalso fixed to the last shaft, a striking-lever loosely sleeved on the same shaft and carrying a spring-pressed pawl adapted to take in the teeth of the last-named ratchet, but normally held out ofcontact with the face of theratchetwheel, a push-lever ,pivotally attached to an arm on the strikingdeverandcarryingsprings which bear, respectively, on opposite sides of the first-named pawl, a hook near the free ,endof the striking-lever, a pivoted detentlever carrying ,a pivoted dog at one end adapted to hold the hook on the striking-lerer, and ,an electro-magnet with an armature for holding the ,detent lever ,and its dog in locking position, substantially as described.

" JACOB P. TIBRELL.

\Vitnesses:

ARTHUR W. Caossnny, A. I). HARltISON. 

